Question

How many variable segments are present in the basic structure of antibody molecules?

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

The correct option is D Four

Although the general structure of all antibodies is very similar, a small region at the tip of the protein is extremely variable. This variable region is present at the end of both light chains and both heavy chains, thereby giving 4 such variable regions in each antibody.

So, the correct answer is 'Four'